Waka_Islands_V0.9.0.zip is a release file of the Minecraft map Waka Islands 1 Survival Island Map, made for Minecraft 1.5.0. It was published on March 13, 2013 and is 4 MB in size. For the full description, screenshots and every other version, visit the Waka Islands 1 Survival Island Map map page.
How to install: Extract the .zip and move the world folder into .minecraft/saves; the map then appears in your Singleplayer list.